Combined key and bolt lock



G. C. ENS-MINGER.

comsmso KEY AND sou LOCK. APPLICATION FILED SEPT. 7. 1920.

1,381,547; PatentedJune 14, 1921.

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Invent :1? Gauge [LEnsmin Er Attorneys UNITED STATES PATENT OFFICE.

COMBINED KEY AND BOLT LOCK.

Specification of Letters Patent.

Patented June 14, 1921.

Application filed September 7, 1920. Serial No. 408,622.

T all whom it may concern e it known that I, GEORGE C. ENSMINGER, a citizen of the United States, residing at Cutler, in the county of Tulare and State of California, have invented certain new and useful Improvements in Combined Key and Bolt Locks, of which the following is a specificatio-n.

This invention relates to door locks and the primary object of the invention is to provide an improved means for effectively preventing the removal of a key from a lock when the bolt has been thrown for preventing actuation of the bolt.

Another object of the invention is to provide an improved attachment detachably associated with a lock, which is adapted to engage a bolt and key after the bolt has. been thrown, so as to effectively prevent the turning of the key in the lock to throw the bolt and to prevent the removal of the key from the lock, thereby absolutely preventing the look from being picked or actuated by unauthorized persons.

A further object of the present invention is to provide a novel bar or bolt, which is adapted to be inserted into and out of the path of the locking bolt and key from the inside of the door, so as to effectively prevent operation and removal of a key from the look after the bolt has been thrown.

A still further object of the present invention is to provide an improved lock attachment of the above character, which is durable and efiicient in use, one that is simple and easy to manufacture, and one which can be placed upon the market and incorporated with a look at a minimum cost.

VVit-h these and other objects in view the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed and illustrated in the accompanying drawing, forming a part of this specification, in which drawings Figure 1 is an elevation of a lock showing one of the side plates removed and illustrating the same constructed for receiving the improved attachment.

Fig. 2 is a sectional view through a lock taken on the line 22 of Fig. 1, showing the improved attachment in looking p-osition.

Fig. 3 is an elevation of one of the escutcheon plates of the lock, and

Fig. at is a perspective View of the improved attachment for the lock.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A indicates a lock associated with a door B, and C the improved attachment therefor.

The lock A is of the usual or any preferred construction, and is shown to be of the ordinary mortise type and is arranged in the door B in the usual manner. As shown the lock A includes the casing 5, the face plate 6, the sliding locking bolt 9, having the usual key sweep and locking tumblers 11. The escutcheon plates 12 are of any preferred configuration and secured to the door B in theusual manner. The escutcheon plates 12 are provided with key holes 13 which aline with key holes 14 in the casing 5 of the lock.

The improved locking attachment C for the lock A includes a bolt 15, which as shown is to be of cylindrical formation and has a portion of its shank threaded as at 16. The outer portion of the shank is provided with a head 17, by means of which the bolt is adapted .to be operated. The threaded shank of the bolt 15 is adapted to be threaded into the bore of a polygonal nut 18, which is counter sunk in the recess 19 in the door 13 directly in back of one of the escutcheon plates 12 and the escutchen plate 12 at this point is provided with an aperture 20 for the reception of the bolt. The lock casing 5 is also provided with an aperture 21, which is adapted to aline with the aperture 20 in the escutcheon plate. If so desired one or more of the tumblers 11 may be provided with recesses or apertures 22 for the reception of the inner end of the bolt 15.

In operation of the improved device the key is inserted through the alined key holes 13 and 14 in the ordinary manner and the lock bolt 9 thrown in the usual way. The shank 16 of the bolt 15 is then threaded into the nut 18 until the inner end of the same arrives into the key sweep 10 and it can be seen that the bolt will engage the inner surface of the forward wall of the key sweep. This will absolutely preclude the throwing of the bolt and it can be seen that the key will be prevented from being turned in the key hole and thus the removal thereof is also prevented. If the tumblers 11 are provided with the openings or recesses 22 for the reception of the inner end of the bolt 15 it can be seen that the tumblers are also prevented from being raised and thus the picking of the lock is further eliminated.

It is to be also understood that the bolt 15 can be placed in the door from either or both sides thereof as may be desired and according to the wishes of the users of the look.

It can be seen that by threading the bolt 15 into the nut 18 that accidental removal and loss of the bolt is eliminated.

From the foregoing description, it can be seen that an especially simple and durable locking means has been provided for absolutely preventing the picking of a lock and which will effectively hold the bolt in its thrown condition and the key against re moval.

Changes in details may be made without departing fromthe spirit or scope of this invention, but what I claim as new is,

1. The combination with a lock including a bolt having a key sweep therein, of an attachment therefor including a removable pin adapted to be placed in said key sweep and in the path of the bolt.

2. The combination with a lock including a bolt having a key sweep and a casing having a key hole, of a removable pin carried by said casing and arranged to be inserted in said key sweep adjacent to the inner surface of the forward wall thereof.

3. The combination with a' door lock ineluding a casing, a sliding bolt mounted in the casing having a key receiving sweep, of an attachment for the lock including a removable and sliding pin carried by the casing and arranged to engage the inner surface of the front wall of the key sweep when the bolt is thrown to its locked position.

4. The combination with a door lock including a casing and a sliding bolt having a key receiving sweep therein, of an attachment for the lock including a removable and an adjustable bolt arranged to move intransverse relation to said bolt, the pin having its shank threaded, a polygonal nut arranged in stationary relation to said lock casing, the pin being threaded into said nut and arranged to be moved into said key sweep for engagement with the inner surface of the rear wall thereof when the bolt has been moved to its locked position.

5. The combination with a lock including a casing, a sliding bolt having a icy receiving sweep therein, and locking tumblers. of an attachment for the lock including a sliding pin adapted to slide into said key sweep and engage the inner surface of the rear wall and one of said tumblers.

6. The combination with a lock including a casing, a sliding bolt having a key receiving sweep and a locking tumbler, the tumbler having a recess formed therein, of a sliding pin arranged to engage in said key sweep and the recess in said tumbler.

GEORGE C. ENSMINGER. 

